PROTOZOA. 543 



xx, P, ii, 1844, p. 413) has composed a theme on the same 

 subject, and remarked thereupon, that various forms of de- 

 velopment of Hcematococcus pluvialis may easily be regarded 

 as Infusoria, since isolated forms of them bear the greatest 

 resemblance to the infusorial genera instituted \>j Ehrenberg, 

 of Chilomonas, Cnjptomonas, Gyyes, Chlamidomonas, Pondo- 

 rina, Chcetoglena, and Chtetotyphla. These naturalists were 

 preceded by Unger, Avho allowed himself to be seduced by 

 his observations on Vaucheria clavata (Die Pflanze im 

 Momente der Thierwerdung, 1843), into the same opinion, 

 that animals could be transformed into plants, and vice versa, 

 plants into animals. The Reporter, however, in a special 

 dissertation (De finibus inter regnum animale et vegetabile 

 constituendis ; Eiiangse, 1844), has remarked that no further 

 conclusion can be drawn from Unger's interesting discoveries, 

 together with which those also of Thuret (Annales des Sc. nat. 

 Botaniqiie, t. xix, 1843, p. 266 ; Recherches sur les organes 

 locomotenrs des spores des Algues) must be mentioned, than 

 that " a ciliated epithelium and ciliary organs are not an 

 exclusive attribute of the animal kingdom/' 



